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How to develop and implement a simple snake game using js

一个新手Original: 2017-09-26 10:23:561912browse

In the past, Nokia’s Snake was all the rage. In an era when games were scarce, it was too difficult to implement using Java. Now, you can create a simple demo with just 20 lines of code to create a web page. Times are progressing

<!doctype html>  
<html>  
<body>  
    <canvas id="can" width="400" height="400" style="background: Black"></canvas>  
    <script>  
        var sn = [ 42, 41 ], dz = 43, fx = 1, n, ctx = document.getElementById("can").getContext("2d");  
        function draw(t, c) {  
            ctx.fillStyle = c;  
            ctx.fillRect(t % 20 * 20 + 1, ~~(t / 20) * 20 + 1, 18, 18);  
        }  
        document.onkeydown = function(e) {  
            fx = sn[1] - sn[0] == (n = [ -1, -20, 1, 20 ][(e || event).keyCode - 37] || fx) ? fx : n  
        };  
        !function() {  
            sn.unshift(n = sn[0] + fx);  
            if (sn.indexOf(n, 1) > 0 || n<0||n>399 || fx == 1 && n % 20 == 0 || fx == -1 && n % 20 == 19)  
                return alert("GAME OVER");  
            draw(n, "Lime");  
            if (n == dz) {  
                while (sn.indexOf(dz = ~~(Math.random() * 400)) >= 0);  
                draw(dz, "Yellow");  
            } else  
                draw(sn.pop(), "Black");  
                setTimeout(arguments.callee, 130);  
        }();  
    </script>  
</body>  
</html>

This is the start of the game:

How to develop and implement a simple snake game using js

This is the end of the game:

How to develop and implement a simple snake game using js

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